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Partners Equity of the Operating Partnership Partners Equity of the Operating Partnership (Details Textuals) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Apr. 15, 2015 | Apr. 06, 2015 | Mar. 11, 2015
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Distributions payable | $ 29,038 us-gaap_DividendsPayableCurrentAndNoncurrent |  | $ 28,871 us-gaap_DividendsPayableCurrentAndNoncurrent |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.90%us-gaap_PreferredStockDividendRatePercentage |  | 6.90%us-gaap_PreferredStockDividendRatePercentage |  |  |
Dividends, Preferred Stock, Cash | 1,725 us-gaap_DividendsPreferredStockCash | 1,725 us-gaap_DividendsPreferredStockCash |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Distributions payable | 29,038 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  | 28,871 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.90%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  | 6.90%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |
6.90% Series E-linked Preferred Units [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.90%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementClassOfStockAxis = bdn_A690SeriesELinkedPreferredUnitsMember |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 25.00 us-gaap_PreferredStockLiquidationPreference / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementClassOfStockAxis = bdn_A690SeriesELinkedPreferredUnitsMember |  |  |  |  |
Dividend Paid [Member] | Subsequent Event [Member] |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Distributions payable |  |  |  |  | 27,300 us-gaap_DividendsPayableCurrentAndNoncurrent / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Dividend Paid [Member] | Subsequent Event [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Distributions payable |  |  |  |  | 27,300 us-gaap_DividendsPayableCurrentAndNoncurrent / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Dividend Paid [Member] | Subsequent Event [Member] | 6.90% Series E-linked Preferred Units [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  | $ 1,700 us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementClassOfStockAxis = bdn_A690SeriesELinkedPreferredUnitsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Dividend Declared [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  | $ 0.15 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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